Ok, been catching up on some stuff but here's my input:
Lower resistances don't always mean bigger clouds - as far as the safety aspect - let's put it in perspective a bit. According to Ohm's Law - .1 Ohm draws from a battery with a completely fresh charge (example 4.2V) 42 AMPS!. On a battery that's still in good shape (3.7V) - 37 AMPS. In technical terms - you would be exceeding the capabilities of the Sony VTC4's - IF - the battery were in a constant drain. Example of constant drain - pushing the fire button in the excess of 60 seconds I believe to be considered CONSTANT DRAIN. Those batteries were NOT intended to be drained PAST 30 AMPS. They're rated for 30 AMPS - DON'T PUSH THEM PAST IT! I know, I know "But Weaver, the batteries are rated for 60 AMPS 'PULSE DISCHARGE'!" Again - I can read spec sheets all day - your safest bet don't push the limits. So on a freshly charged VTC4 (using the WORST POSSIBLE SCENARIO of 4.2V) the safest resistance to built at IMO - is ABOVE .1 Ohm. ABOVE. Not BELOW, ABOVE. So shoot anywhere from .12 and higher for safety reasons. .15 will get you out of the danger zone altogether.
Now with all that being said - clouds. I love them, you love them, we all love them. Keep in mind - it takes some time to perfect the perfect build for the perfect clouds - and the perfect air -> coil -> wick -> juice ratio. IMO the larger the airflow, the better off you'll be, especially when taking on some of the higher VG juices - as far as ChrisBBacon is concerned - keep playing around with it dude, you'll eventually get it down. Remember, practice takes perfect - heres a picture of my most recent builds, resistances, etc. Don't mind the mess -
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MutationX - 8 Wrap - 4x Micro Coil - 24 AWG - Rayon Build
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Resistance Check - .17 Ohms
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Resistance Check - .13 Ohms
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Doge - 6 Wrap - 2x Micro Coil - 20 AWG - Rayon Build
As you can tell, I keep away from the .10 mark, and I do so for safety reasons. The MutationX is built for flavor - not so much clouds. Plus I usually ONLY run quads on my IPV3. For battery life reasons. And it's good. As far as the Doge is concerned - it will fire some clouds and get good flavor with a fully charged battery. That runs on anything and everything.